var idcas=null;
var rychlost=60;
var idecka=[];
idecka=[[0,0,1],[0,0,1],[0,0,1],[0,0,1]];

function changeOpac(id,opacity)
{
var o,p;
o=opacity;
p=o;
  if (o==100) o=99.9;o=o/100;	//FF bug 99.9
	var object = document.getElementById(id).style; 
	object.display=(p>0)?"block":"none";
	     object.opacity = o;
	  object.MozOpacity = o;
	object.KHTMLOpacity = o;
	      object.filter = "alpha(opacity=" +p+ ")";
}

function ukaz(i)
{
idecka[i][0]=1;
idecka[i][2]=100;
}

function skryj(i)
{
idecka[i][0]=1;
idecka[i][2]=-10;
}

function akcemenu()
{
clearTimeout(idcas);
var i,j,id;
for (i=0;i<4;i++) {
   if (idecka[i][0]==1) {
	    j=idecka[i][1];
    	j=j+idecka[i][2];
      if (j>100) j=100;
      if (j<0) j=0;
      
	    if (j!=idecka[i][1]) {
    	   changeOpac('m'+i,j);
    	   if (j==100 || j==0) {
            idecka[i][0]=0;
         }
    	   idecka[i][1]=j;
    	}
   }
}
idcas=setTimeout("akcemenu()",rychlost)
}